Simplicity Broadmoore unable to pull its own weight

Just joined as I too have a broadmoor that struggles to pull (and makes a din), local dealer said tranny is stuffed, not worth buying a new one but he will look to see if he has a second hand one. I thought the belt was slipping but this guy says over 500hrs they tend to let go. I have found service kits and I am keen as the rest of the machine is great, shame to scrap it. So, has anyone serviced their hydrostatic drive (simplicity says sealed for life and only serviceable by them!) yeh right.
 
It is not difficult to do an motor/pump replacement, they are drop in parts .
However what is difficult is cleaning the tranny externally then internally because 5/8 of SA dust in the tranny oil will shorten it's life drastically.
I flush with kerro then with clean oil then do the work & seal the case.
The work is done in the workshop bathroom after the walls have been wetted down & if I am going to leave the tranny open for any reason then it gets covered with a damp rag
 
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